Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tong cong » trong cong, cong cong, dung cong
canh cua » manh cua, hanh cua, cach cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
anh cua » manh cua, hanh cua, anh ca

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - lan ((anh cua) OR (canh cua)) tong cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - lan ((anh cua) OR (canh cua)) tong cong dan toan cao*.